package com.cn.common.utils;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;


/**
 * 普通类调用Spring bean对象：
 * 说明：
 * 1、此类需要放到App.java同包或者子包下才能被扫描，否则失效。
 *
 * @author Administrator
 */

@Component
public class SpringUtils implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;
    private final Log logger = LogFactory.getLog(getClass());

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if (SpringUtils.applicationContext == null) {
            SpringUtils.applicationContext = applicationContext;
        }
        logger.info("---------------------------------------------------------------------");
        logger.info("---------------------------------------------------------------------");
        logger.info("========ApplicationContext配置成功,在普通类可以通过调用SpringUtils.getAppContext()获取applicationContext对象,applicationContext=" + SpringUtils.applicationContext + "========");
        logger.info("---------------------------------------------------------------------");

    }

    //获取applicationContext  
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过name获取 Bean.  
    public static Object getBean(String name) {
        return getApplicationContext().getBean(name);

    }

    //通过class获取Bean.  
    public static <T> T getBean(Class<T> clazz) {
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean  
    public static <T> T getBean(String name, Class<T> clazz) {
        return getApplicationContext().getBean(name, clazz);
    }

}  